Thermal shrink packaging machine

ABSTRACT

A thermal shrink packaging machine is revealed. A receiving base is disposed on a machine plate. Two slide rails are respectively arranged at two sides of the receiving base while a slide unit is set between the two slide rails. A power source is arranged at the receiving base and an output shaft of the power source is connected to the slide unit. The slide unit is disposed with a cutter and a vacuum nozzle. A curved guiding piece is set on the machine plate. A tear part cutter is arranged over the cutter. Thereby a tear part is formed by the tear part cutter cutting correspondingly to a tear line of thermal shrink film when the cutter is cutting the thermal shrink film. Thus users can tear apart the thermal shrink film along the tear line easily by holding the tear part.

BACKGROUND OF THE INVENTION

1. Fields of the Invention

The present invention relates to a thermal shrink packaging machine,especially to a tear part cutter of a thermal shrink packaging machinethat cuts correspondingly to a tear line of thermal shrink film to forma tear part while cutting the thermal shrink film. Thus users can holdthe tear part to tear apart the thermal shrink film along the tear lineconveniently so as to increase practical value of the device.

2. Descriptions of Related Art

Generally, thermal shrink film is used in packaging of drinking bottlesor food cans and is printed with product name, trademark, place ofproduction, product manual, advertising slogan, etc. for productidentification, increasing product purchase and improving sales rate ofproduct. When the thermal shrink film is covered over bottle caps, it'san anti-theft design. Consumers can learn whether the drinking bottle orfood can has been opened by checking the thermal shrink film. Thus theproduct safety is ensured.

A tearing device of a shrinkable label inserting machine has beendeveloped. The machine includes a right/left (R/L) and liftingcontroller and a base. The R/L and lifting controller is fixed on andconnected to the base. One side of the base is disposed with a drivemotor for driving a first gear. There is an inner space inside the basefor receiving a tear wheel pivoted horizontally. A first adjustment setis inserted through and arranged at one side of the base and the firstadjustment set is also connected to a roller seat pivoted with a roller.Thus the roller seat is moved forward/backward under the control of thefirst adjustment set. A second gear is set at one side of the tear wheeland is engaged with the first gear. The vertical and horizontal movementof the base is adjusted by the R/L and lifting controller while thefirst adjustment set is for adjusting the distance between the rollerand the tear wheel. Thus a thermal shrink film of the shrinkable labelinserting machine is passing between the roller and the tear wheel to becut by the tear wheel and having a tear line. The tear line is tiny andbeautiful.

However, although the above tearing device of the shrinkable labelinserting machine can cut the thermal shrink film to form the tear lineon the thermal shrink film. While in use, only the tear line is formedon the thermal shrink film and there is no projecting piece for tearingformed on the thermal shrink film. While in use, it's difficult forusers to apply force to the thermal shrink film for tearing apart thethermal shrink film.

Thus there is room for improvement and a need to provide a tear partcutter of a thermal shrink packaging machine with higher practicalvalue.

SUMMARY OF THE INVENTION

Therefore it is a primary object of the present invention to provide athermal shrink packaging machine having a cutter and a tear part cutterarranged over the cutter. While the cutter is cutting a thermal shrinkfilm, the tear part cutter cuts correspondingly to a tear line of thethermal shrink film to form a tear part. Thus users can tear apart thethermal shrink film conveniently along the tear line and the device isof higher practical value.

In order to achieve the above object, a thermal shrink packaging machineaccording to the present invention includes a machine body with amachine plate. The machine plate is arranged with a receiving base of afilm extending and cutting unit. Two corresponding slide rails arerespectively disposed on two sides of the receiving base while a slideunit is set between the two slide rails. A power source is arranged atthe receiving base and an output shaft of the power source is connectedto the slide unit. The slide unit is disposed with a cutter while avacuum nozzle is arranged at the bottom of the slide unit, at theposition corresponding to the cutter. Corresponding to the vacuumnozzle, the machine plate is disposed with a curved guiding piece. Inthe film extending and cutting unit, a tear part cutter is projectinglyarranged over the cutter. While the cutter is driven by the power sourceto cut the thermal shrink film, the tear part cutter cutscorrespondingly to a tear line of the thermal shrink film to form thetear part.

BRIEF DESCRIPTION OF THE DRAWINGS

The structure and the technical means adopted by the present inventionto achieve the above and other objects can be best understood byreferring to the following detailed description of the preferredembodiments and the accompanying drawings, wherein

FIG. 1 is a perspective view of an embodiment according to the presentinvention;

FIG. 2 is a cross sectional view of an embodiment according to thepresent invention;

FIG. 3 is a partial enlarged view of a cross section of an embodimentaccording to the present invention;

FIG. 4 is a schematic drawing showing an embodiment in use according tothe present invention;

FIG. 5 is another schematic drawing showing an embodiment in useaccording to the present invention;

FIG. 6 is a further schematic drawing showing an embodiment in useaccording to the present invention;

FIG. 7 is a schematic drawing showing thermal shrink film after cuttingof an embodiment according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring from FIG. 1 to FIG. 3, a machine body 1 of the presentinvention is arranged with a film feeding unit 2, a film extending andcutting unit 3, a film guiding unit 4 and a film conveying unit 5.

The machine body 1 is disposed with an inclined machine plate 11 so asto arrange the film feeding unit 2 at the machine body 1. The filmfeeding unit 2 is set with a guiding part 21 and a plurality of guidewheels 22. A roll of thermal shrink film 6 is arranged around theguiding part 21 and is driven to move by the guide wheels 22. Areceiving base 31 of the film extending and cutting unit 3 is disposedon the machine plate 11 of the machine body 1. Each of two correspondingslide rails 32 is arranged at each of two sides of the receiving base 31while a slide unit 33 is set between the two slide rails 32 on thereceiving base 31. A power source 34 is installed on the receiving base31 and an output shaft 341 of the power source 34 is connected to theslide unit 33. The slide unit 33 is arranged with a cutter 35. A vacuumnozzle 36 is disposed on the bottom of the slide unit 33, at theposition corresponding to the cutter 35 and is connected to a vacuummachine. A curved guiding piece 37 corresponding to the vacuum nozzle 36is arranged at the machine plate 11. Two guide plates 41 of the filmguiding unit 4 are respectively set under two sides of the machine plate11 of the machine body 1 and corresponding to the guiding part 21 of thefilm feeding unit 2. A film funnel 42 is arranged outside the bottom endof the two guide plates 41 and is above the cutter 35 of the filmextending and cutting unit 3. The film conveying unit 5 is disposed onthe machine plate 11 of the machine body 1, above the film extending andcutting unit 3. The film conveying unit 5 having a power source 51 andan output shaft 511 of the power source 51 is assembled with andconnected to an ejector plate 52. The ejector plate 52 is positionedbetween the vacuum nozzle 36 and the curved guiding piece 37 of the filmextending and cutting unit 3. In the film extending and cutting unit 3,a tearing cutter 38 is formed above the cutter 35 projectingly.

While in use, referring to FIG. 4, a roll of the thermal shrink film 6is disposed around the guiding part 21 of the film feeding unit 2. Thethermal shrink film 6 is guided and moved by the guide wheels 22 so thatthe thermal shrink film 6 is inserted between the two guide plates 41 ofthe film guiding unit 4. Then the thermal shrink film 6 is moved alongwith the guide plates 41, downward to the film funnel 42 and further fedover the cutter 35 of the film extending and cutting unit 3 smoothly. Atthis moment, the power source 34 of the film extending and cutting unit3 drives the slide unit 33 to move toward the thermal shrink film 6 bythe output shaft 341. Thus the cutter 35 together with the tearingcutter 38 is going to cut the thermal shrink film 6. The vacuum nozzle36 of the film extending and cutting unit 3 sucks one side of the cutthermal shrink film 6, as shown in FIG. 5. Referring to FIG. 6, thecurved guiding piece 37 disposed correspondingly to the vacuum nozzle 36absorbs the other side of the thermal shrink film 6 due to staticelectricity. Thus the thermal shrink film 6 is extended. While thethermal shrink film 6 is cut by the cutter 35, the tearing cutter 38also cuts the thermal shrink film 6 to form a tear part 62 of thethermal shrink film 6 with a tear line 61, as shown in FIG. 7. Next thefilm conveying unit 5 moves the ejector plate 52 toward the positionbetween the vacuum nozzle 36 and the curved guiding piece 37 of the filmextending and cutting unit 3 by the output shaft 511. Along with themovement of the ejector plate 52, the thermal shrink film 6 absorbed andextended between the vacuum nozzle 36 and the curved guiding piece 37 iswrapped around a main body or a cap of containers passed by under thethermal shrink packaging machine. Thus the thermal shrink film 6 iscovered over the cap or the main body of the container quickly andconveniently. When users want to tear apart the thermal shrink film 6,they can hold the tear part 62 and tear along the tear line 61 easilyand conveniently.

In summary, compared with the structure available now, the presentinvention further includes a tear part cutter disposed over the cutter.Thus the tear part cutter cuts the thermal shrink film correspondinglyto the tear line to form the tear part when the cutter is cutting thethermal shrink film. Therefore users can hold the tear part to tearapart the thermal shrink film along the tear line easily.

Additional advantages and modifications will readily occur to thoseskilled in the art. Therefore, the invention in its broader aspects isnot limited to the specific details, and representative devices shownand described herein. Accordingly, various modifications may be madewithout departing from the spirit or scope of the general inventiveconcept as defined by the appended claims and their equivalents.

What is claimed is:
 1. A thermal shrink packaging machine comprising: areceiving base of a film extending and cutting unit disposed on amachine plate of a machine body; each of two sides of the receiving basearranged with a slide rail, a slide unit set between the two slide railson the receiving base; a power source arranged at the receiving base andan output shaft of the power source connected to the slide unit; acutter disposed on the slide unit and a vacuum nozzle corresponding tothe cutter and arranged on bottom of the slide unit; and a curvedguiding piece corresponding to the vacuum nozzle set on the machineplate; wherein the film extending and cutting unit includes a tear partcutter arranged over the cutter; the tear part cutter cutscorrespondingly to a tear line of thermal shrink film to form a tearpart on the thermal shrink film while the power source drives the cutterto cut the thermal shrink film.